Hard X-ray spectral properties and discovery of narrow annhilation line in the spectrum of Nova MUSCAE

Details Hard X-ray spectral properties and discovery of narrow annhilation line in the spectrum of Nova MUSCAE Hard X-ray spectral properties and discovery of narrow annhilation line in the spectrum of Nova MUSCAE

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..695g&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 13, no. 12, p. (12)695-(12)703

Astronomy and Astrophysics

Astronomy

Black Holes (Astronomy), Light Curve, Novae, Positron Annihilation, X Ray Astronomy, X Ray Spectra, Curve Fitting, Ginga Satellite, Iue, Photomasks, Rosat Mission, Satellite-Borne Instruments, X Ray Telescopes

Scientific paper

The observations of X-ray Nova in Musca (GRS1124-684) by two coded mask telescopes on board GRANAT observatory provided spectral data in broad 3 - 1300 keV band. During these observations, spanned over approximately a year, the Nova was detected in three apparently different spectral states, corresponding to different epochs of the soft X-ray light curve: (1) A spectrum with two distinct components (soft, below approximately 8 keV and hard power law tail with slope approximately 2.5, detected up to approximately 300 keV). The soft emission changed gradually with characteristic decay time around 30 days, while power law component exhibited strong variability on the time scales of several hours and decreased much more slowly. (2) A soft spectrum (without hard power law tail), observed during the 'kick' of the soft X-ray light curve. (3) A hard power law spectrum with slope approximately 2.2. Thus, while the 3 - 300 keV luminosity decreased by more than an order of magnitude, the source passed through all spectral states known for galactic black hole candidates (Cyg X-1, GX339-4, 1E1740.7-2942, GRS1758-258, etc.). On January 20-21 1991, the SIGMA telescope aboard GRANAT detected a relatively narrow variable emission line near 500 keV with net flux approx. = 6 x 10-3 phot/s/sq cm, most probably related with electron-positron annihilation processes, occurring in the source. Additional excess above power law continuum, centered around approximately 200 keV, was found during this observation.

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